It was the type of display Ronny Deila has yearned for since taking over and gives them the perfect platform for Wednesday's Champions League play-off against Maribor.

The build-up to the match had been dominated by the continuing debacle surrounding but Celtic quickly put that controversy behind them.

The mood inside the stadium was already buoyant as the former owner Fergus McCann, very much considered the club's saviour and the man who created the foundations for their more recent success, unfurled the league flag to mark last season's triumph.

That set the tone for a game that sparked into life from the off.

Callum McGregor had already rattled the post and Gary Mackay-Steven slipped a fabulous opportunity wide by the time Denayer found the net.

A Commons corner was dealt with poorly by Callum Morris and, when the ball fell to the feet of the young Belgian defender, he side-footed it into the top corner with all the aplomb of a top striker.

Celtic were moving the ball more slickly than they had done so far this season and Emilio Izaguirre stung the palms of Radoslaw Cierzniak, but the home side's desire to press the opposition high up the park left them vulnerable to precise counter-attacking.

Commons stooped to head Celtic's second

That was what United were offering on occasion and Mackay-Steven latched onto a swiftly-taken Rankin free- kick and rounded Craig Gordon, only for Virgil van Dijk to make a terrific saving tackle.

But United's downfall was slack defending and Commons was left unmarked at the near post to nod into the net from a Stokes corner.

Paul Paton was then caught out by Johansen - snapping at the United midfielder's heels - who robbed his opponent before slotting past Cierzniak.

Those goals bred confidence and Celtic turned on the style, Berget battering the ball off the bar and Stokes forcing a terrific save from Cierzniak before the half-time whistle sounded.

Much as the game looked beyond United, there was still a large sigh of relief from Charlie Mulgrew when Gordon got down superbly to tip Nadir Ciftci's shot round the post after the Turk had robbed the Celtic captain of possession.

Moments later Celtic's cushion was even more comfortable as Stokes' free-kick appeared to sail all the way across goal and into the back of the net, though Mulgrew claimed a touch.

Stokes was central, too, to Celtic's fifth. Cierzniak saved brilliantly from the striker's venomous drive, but when Stokes' resultant corner was headed back across goal by Efe Ambrose, Berget was on hand to head home his first goal for the club.

Gordon, who appears to have put his injury woes behind him, was unhappy to miss out on a clean sheet as Rankin's low shot from the edge of the box was deflected beyond him and into the net.

Berget added a sixth with the final kick of the ball, though that move was tinged with anxiety as substitute James Forrest pulled up with an injury.

But those were minor blemishes on an otherwise superb day for Celtic, while United will have to address the defensive frailties if this result is to go down simply as a blip in their quest to challenge for second place.

McCann addressed fans and unfurled the Premiership flag before kick-off

Stokes' free-kick found its way through a crowded area and into the net

Rankin ensured Gordon would not get a shut-out

Commons and Berget were both on target ahead of Wednesday's trip to Maribor